Carl wilhelm eabitz



(No Model.)

C. W. RABITZ PILTERING APPARATUS.

No 403,073. Patented May 7, 1889.

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l UNITED STATES PATENT OFFICE.

CARE. VILHELM RABITZ, OF HAMBURG, GERMANY, ASSIGNOR TO HEINRICH JRGEN ERNST JENSEN AND'JOHANN JULIUS ADOLPH KOHFAHL, BOTH OF SAME PLACE.

FILTERING APPARATUS.

SPECIFICATION forming pare of Letters Patent No. 403,073, dated May r, 1889.

Application tiled January 19, 1888. Serial No. 261,264. (No model.) Patented in Germany December 18, 1884, No. 81,915, April 2,1886,No. 38,426, and May 14,1887, No. 41,357; in England April 24, 1886, No. 5,669, and in Belgium June 17, 1887,

1887 of which the following is a specication. v

My invention. relates to improvements in filtering apparatus in which the liquid is fil- 15 tered by passing from outside into the interior of suitable filtering-drums; and the objects of my improvements are, first, to facilitate the cleaning of the filtering-bed covering said drums, and, second, to provide Ineans for 2o supplying a uniform deposit of filtering bers upon the filtering-bed in order to condense its porous surface. I attain these objects by the mechanisms illustrated in the accompa-v nying drawings, in which- 2 5 Figure 1 is avertical longitudinal sectional view of my improved filter. Fig. 2 is a crosssectional view thereof. Fig. 8 is an enlarged sectional detail view showing the rings for securing the filtering material to the drums. 3o Similar letters refer to similar parts throughout the several views.

The apparatus consists of a vessehc, in which are inclosed one or Inore hollow filteringdrums,b, the perforated surfaces of which be- 3 5 ing covered with layers c of felt, cellulose, or similar substances, and in front of which are arranged a corresponding number of brushes, fi, which serve to clean the ltering-surfaces of the drums, either by rotation of the brushes 4o or drums, without taking the apparatus to pieces. A partly-hollow shaft, his journaled within the cylindrical vessel a in such a manner that its solid end projects beyond the cover of the said vessel and serves to attach 45 a suitable crank or other means thereon for rotating the shaft. Upon this shaft d are attached the hollow drums b, which may be filled with charcoal, gravel, or other material. The interior of the drums 'communicates through holes d with the interior of the hol- 5o low shaft d. The liquid entering into the vessel ce through the supply-pipe g is discharged through the filtering-bed c into the drums b and therefrom into the hollow shaft d, which, passing through a separate'compart- 55 ment or reservoir, f, of the vessel a, admits the filtered liquid to flow out through the openings e into the said compartment f, wherefrom it may be drawn off through the pipe h according to the supply. The residue 6o of the filtered liquid covering the filteringbed of the drums is taken off, by brushes t', which are placed before the drums b in such a manner as to brush the filtering-bed c when the hollow shaft d is rotated, and may then 65 be drawn off at the bottom of the vessel a by means of a waste-cock or screw, 7c, while the supply-cock is open.

Instead of rotating the drums, the brushes may be arranged in a suitable frame and ro- 7o tated from outside while the filtering-drums remain immovable.

In order to supply a uniform deposit of mineral or vegetable filtering fibers-such as asbestus, cellulose, tbe-upon the porous sur- 75 face of the filter-bed, a chamber, y, containing the agitator w, is attached to the vessel a. The mixing-chamber y communicates by the conducting-pipes u t and the branches swith interior of the vessel a, from which it can be 8o shut off by the cock o. The asbestus or cellulose fiber is poured into the mixing-reservoir after removal of the screw z, and after the latter is closed again the liquid enters through the supply-cock g, and while the 8 5 agitator is set in motion and the cock lv is opened the asbestus or cellulose, mixed with the filtering-liquid, is conducted through the branch pipes s into the vessel a to each of the filtering-drums. The liquid penetrates 9o the filtering-beds c of the drums, while the asbestus or cellulose liber is deposited on their surfaces for the purpose above mentioned. When cleaning the drums, the asbestus or cellulose fiber will be brushed off from the drums CZ by the brushes c' With the residue of the filtered liquid and drawn off from the vessel a, as above specied.

The filtering-beds c, consisting` of felt or cloth, are attached to the drums by means of inner and outer metal rings, c c2, in such a manner that either one clasps the turneddown edge of one of the annular-shaped felt or clotch covers of the drums. l

Having' thus particularly described and ascertained the nature of my invention and in what manner the same is t0 be performed, I declare that what I claim is- The combination, in a filtering' apparatus, of a chamber, one or more iiltering-drums located therein and covered with felt or cloth and provided with brushes for cleaning the filtering-surface, a mixing-chamber located at one side of the main chamber for containing the filtering,` fibers and communicating with said main chamber, and an agitator located in said mixing chamber, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two Witnesses, this 2d day of December, 1887.

CARL vWILHELM RABITZ.

Vitnesses:

ALEXANDER SPECHT, HERMANN GARTEN. 

